Common comparison error
Sample size from a selected backtest, demo account, or short sample is not a guaranteed Confidence interval result.
GlossaryStrategy & risk
Sample size
The number of eligible observations used to calculate a rate or performance statistic. Small samples produce less reliable estimates than larger, clearly defined samples.
Practical use
How to verify Sample size
Read Sample size together with Observed win rate, Confidence interval, Session limit. The comparison must preserve the exact rule, value, state, and evidence described below.
A neutral example
Two samples share the same average for Sample size; one has five consecutive losses and the other twelve. Sequence and bankroll effects distinguish them from Observed win rate. What makes this an example of Sample size is that the number of valid observations controls uncertainty and must exclude or classify void, rejected, and missing rows consistently.
Evidence path
Where to verify Sample size
Use the source that governs the exact contract, account, entity, or platform state. A general definition cannot replace current broker terms.